Question

A spaceship of mass 2.1×106 kg is cruising at a speed of 5.8×106
m/s when the antimatter reactor fails, blowing the ship into three
pieces. One section, having a mass of 4.6×105 kg, is blown straight
backward with a speed of 2.5×106 m/s. A second piece, with mass
7.9×105 kg, continues forward at 1.3×106 m/s.

Part A
What is the speed of the third piece?
Express your answer using two significant figures.m/s